TM 5-4310-352-14
grooves, then move motor away from compressor and
3-8. V-Belts (Matched Pair)
tighten mounting nuts.
a. Inspection.
(1) Make a visual inspection of belt condition
NOTE
to determine if the belts require removal for cleaning
A quick check for proper belt adjustment is
and deglazing. If deglazing appears necessary remove
to observe belts while compressor is in op-
the back belt guard (para 3-7).
eration. If bottom of belt seems to droop
(2) Loosen belt adjustment screw (fig. 1-2)
slightly below line from pulley to pulley, the
and nuts securing motor to receiver. Move motor toward
belts should be in adjustment.
com- pressor, then lift belts off of the pulleys.
b. Cleaning.
(3) A measured adjustment, assuring no strain
on bearings, is accomplished as follows:
WARNING
(a) Measure distance between pulley cen-
Dry cleaning solvent, P-D-680, used
ters.
to clean parts is potentially dange r-
(b) At center of belt span, apply a force
ous to personnel and property. Do
perpendicular to the span, by attaching a spring scale to
not use near open flame or excessive
both belts. The force applied to the spring scale should be
heat. Flash point of solvent is 100
F
sufficient to deflect the belts 1/64 in. for every inch of span.
(38 ) - 138 (59 ).
C
F
C
If span is 36 in., the deflection should register 1-7/8 lbs. If
scale registers 178s lbs, the belt should be loosened
(1) Use a cloth dampened in cleaning solvent
slightly. If scale registers less than 1-1/4 lbs, the belts
Fed. Spec. P-D480 to remove oil and dust film. If the
should be tightened slightly.
belts appear to have been saturated, and the heat has
glazed the surfaces of the vee's proceed as follows:
NOTE
(2) Use a medium grade of grit paper (not
New drive belts may be left a little tight, to
emery cloth) and rough up the surfaces with strokes of
take care of stretch during run in.
uneven direction.
(3) Wipe off all grit particles. When surface
3-9. Dehydrator and Outlet Air Filter
has been deglazed, install the belts on pulleys.
c. Adjustment.
front of the compressor assembly (fig. 1-1), and remove
moisture from outlet (service) air. The outlet air filter
NOTE
(heated) is located at right end of the compressor, and is
When installing new belts, never pry the
the primary source of dry service air.
belts over the pulley groves.
b. Dehydrator Inspection and Service
(1) With all power off, use the spanner wrench
(1) Be sure that the motor has been moved
and remove the locking nut (5, fig. 3-3) and vessel (4). The
closer to the compressor, by loosening of mounting nuts,
filter cartridge (3) will drop with the vessel. Remove the
coupled with loosening of adjusting nut (fig. 1-2).
preformed packing (2).
(2) Place belts (the matched pair) in proper
3-8
